Section 06 PRODUCTS OF THE CHEMICAL OR ALLIED INDUSTRIES 28 INORGANIC CHEMICALS; ORGANIC OR INORGANIC COMPOUNDS OF PRECIOUS METAL, OFRARE-EARTH METALS, OF RADIOACTIVE ELEMENTS OR OF ISOTOPES 28 18 ARTIFICIAL CORUNDUM, WHETHER OR NOT CHEMICALLY DEFINED; ALUMINIUM OXIDE; Commodity Code Description 28 18 10 ARTIFICIAL CORUNDUM, WHETHER OR NOT CHEMICALLY DEFINED 28 18 20 ALUMINIUM OXIDE (ALUMINA), OTHER THAN ARTIFICIAL CORUNDUM 28 18 30 ALUMINIUM HYDROXIDE